Journal December 1836
p21“Southey's life of Cowper - Dr. C. had been reading it - spoke of it as being merely a judicious compilation.”
Fuller, Margaret. "Journal December 1836." Houghton Library, Harvard University; MS Am 1086; Box 3.
Inferred Fuller names Cowper and discusses his letters specifically; title inferred as Letters (the collected correspondence) based on Channing's praise of their naiveté and delicacy.